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-rw-r--r--fs/ubifs/debug.c20
1 files changed, 11 insertions, 9 deletions
diff --git a/fs/ubifs/debug.c b/fs/ubifs/debug.c
index 1aaa9f51948..5dc993fdca8 100644
--- a/fs/ubifs/debug.c
+++ b/fs/ubifs/debug.c
@@ -2646,20 +2646,18 @@ static int power_cut_emulated(struct ubifs_info *c, int lnum, int write)
return 1;
}
-static void cut_data(const void *buf, unsigned int len)
+static int corrupt_data(const struct ubifs_info *c, const void *buf,
+ unsigned int len)
{
unsigned int from, to, i, ffs = chance(1, 2);
unsigned char *p = (void *)buf;
from = random32() % (len + 1);
- if (chance(1, 2))
- to = random32() % (len - from + 1);
- else
- to = len;
+ /* Corruption may only span one max. write unit */
+ to = min(len, ALIGN(from, c->max_write_size));
- if (from < to)
- ubifs_warn("filled bytes %u-%u with %s", from, to - 1,
- ffs ? "0xFFs" : "random data");
+ ubifs_warn("filled bytes %u-%u with %s", from, to - 1,
+ ffs ? "0xFFs" : "random data");
if (ffs)
for (i = from; i < to; i++)
@@ -2667,6 +2665,8 @@ static void cut_data(const void *buf, unsigned int len)
else
for (i = from; i < to; i++)
p[i] = random32() % 0x100;
+
+ return to;
}
int dbg_leb_write(struct ubifs_info *c, int lnum, const void *buf,
@@ -2679,7 +2679,9 @@ int dbg_leb_write(struct ubifs_info *c, int lnum, const void *buf,
failing = power_cut_emulated(c, lnum, 1);
if (failing)
- cut_data(buf, len);
+ len = corrupt_data(c, buf, len);
+ ubifs_warn("actually write %d bytes to LEB %d:%d (the buffer was corrupted)",
+ len, lnum, offs);
err = ubi_leb_write(c->ubi, lnum, buf, offs, len);
if (err)
return err;